Improvement in bolts



L. F.` BURRELL.

Bolt.

No. 212,539. Patented Feb.`25,'1s79.

Tirlvrrnil)v STATES.

PATENT Enron;

LOUIS F. BURRELL, OF CHICAGO, -ILLINOIS.

IMPROVEMENT IN BOLTS.

Speciiication forming part of Letters Patent No. 212,539, dated February25, 1879 5 application filed November 12, 1878.

To all lwhom it may concern:

Be it known that I, Louis F. BURRELL, of the city of Chicago, State ofIllinois, have invented certain new and useful Improvements inSash-Fastenings 5 and I do hereby declare that the following is a full,clear, and exact description of the invention, reference being had tothe accompanying drawings and to the letters of reference markedthereon, which form a part of this specification.

My invention relates to an adaptation of a round bolt to themeeting-rails of windowsash, to constitute a sash-fastener, and to othersimilar situations 5 and it consists in providing the bolt with apinnearits protruding end, and in providing the barrel and striker withcross-slots to receive this pin and the knob-shank, so that by rotatingthe bolt after it has been thrown it is made to tie or bind the tworails together through the engagement of the knob-shank and pin in saidcross-slots.

In the drawings, Figure l is a top view of the barrel and striker withthe knob retracted. Fig. 2 is a side view of the bolt provided with thepin; and Fig. 3 is a sectional view of a cast-metal striker, showing theslot for the reception of the pin, in the form of a shallow groove, inthe under face thereof.

Ais a round bolt, of suitable size for the purpose, of which B is thebarrel and C the striker. The bolt A has the usual knob K,

connected by a shank to the bolt, and is also prcvided with the pin Pnear its protruding en( The barrel B has the longitudinal slot S, inwhich the knob-shank works when the bolt is thrown or retracted. Saidslot has at its inner end the transverse extension S', and it may havethe outer extension, S.

The striker has the longitudinal slot s, for the entrance of the pin l?when the bolt is thrown, and this slot is also provided with atransverse extension, s.

The knob K and pin I are preferably in line on one side of the bolt, sothat the slots S ands may be in line and placed as far as possible onone side of the respective parts of the bolt-case, in order to give alonger rotary throw to the knob andY pin in the transverse slots, aswill be further explained.

` If the transverse slots S and s be directed straight across the barreland striker, the effect of rotating the knob-shank and pin into themwill be simply to tie the meeting-rails to which the bolt is applied. It'is desirable ina meeting-rail fastening, however, to provide means bywhich the rails maybe drawn forcibly together, if apart, as well as heldor clamped when together. I therefore make the inner walls of thetransverse slots spoken of oblique, as shown, so that the knob-shank andpin, in being rotated into them, will bear /upon said inner walls anddraw the barrel and striker firmly together. The outer walls aredirectly transverse, making the entrance to the cross-slots broad, .sothat the shank andpin will enter the latter freely, whether the rails towhich the bolt is applied are in eontactor apart.

By locating the longitudinal slots S ands Y at one side, as indicated inthe drawings, and extending the transverse slots S and s to the oppositeside of the boltcase, sufficient gain may be obtained to meet allordinary requirements.

Obviously but one of the transverse slots need havethe oblique innerwall; but the bolt works better when the gain is divided between thetwo, as shown.

When the case is formed of sheet metal it will be necessary to bridgethe slot s in the striker to give the latter proper strength; but, ifthe case be cast, the slot may form a groove in the inner face of thestriker, as illustratedV in Fig. 3.

Provision is made for-locking the bolt in knob K and pin P, combinedwith barrel B and keeper C, provided with longitudinal slots S s andtransverse slots S s', having sides inclined in opposite directions, asshown, for the purpose of drawing the barrel and keeper together whenthe bolt is rotated upon its axis.

LOUIS F. BURRELL. Witnesses M. E. DAYTON, WM. M. STANLEY.

